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Bench Mark Sheet for 8742205, GRAVELINE BAYOU ENTRANCE MS

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                                                
Station ID: 8742205                         PUBLICATION DATE:  10/02/2014
Name:       GRAVELINE BAYOU ENTRANCE                          
            MS
NOAA Chart: 11373                           Latitude:   30° 21.7' N (  30.36170)
USGS Quad:  PASCAGOULA                      Longitude:  88° 39.8' W ( -88.66330)





                         T I D A L   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:  2205 A 1980
                         DESIGNATION:          874 2205 A

MONUMENTATION:           Tidal Station disk                    VM#:        21226
AGENCY:                  National Ocean Survey                 IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   30° 21.7' N (  30.36170)          LONGITUDE:  88° 39.8' W ( -88.66330)


The benchmark is a disk 23.5m (77 ft) N of waters edge (6.1m E of pier), 15.0m
(49.3 ft) W of 36-inch oak, 2.9m (9.8 ft) ESE of SE corner of Pier Graveline
Restaurant, 0.4m (1.4 ft) SW of power pole and 0.1m below grade encased in a pvc
pipe and concrete.



                         BENCH MARK STAMPING:  2205 B 1980
                         DESIGNATION:          874 2205 B

MONUMENTATION:           Tidal Station disk                    VM#:        21227
AGENCY:                  National Ocean Survey                 IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   30° 21.7' N (  30.36170)          LONGITUDE:  88° 39.8' W ( -88.66330)


The benchmark is a disk 23.2m (76 ft) NW of 22-inch oak, 19.7m (64.5 ft) W of
30-inch oak, 1.6m (5.3 ft) NNE of edge of drive going through gateway to Point
Clear Rivera Property Owners Inc, 0.4m (1.4 ft) E of 6-foot chainlink fence and
is 0.1m below grade encased in pvc pipe and concrete.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                                                
Station ID: 8742205                         PUBLICATION DATE:  10/02/2014
Name:       GRAVELINE BAYOU ENTRANCE                          
            MS
NOAA Chart: 11373                           Latitude:   30° 21.7' N (  30.36170)
USGS Quad:  PASCAGOULA                      Longitude:  88° 39.8' W ( -88.66330)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  2205 C 1980
                         DESIGNATION:          874 2205 C

MONUMENTATION:           Tidal Station disk                    VM#:        21228
AGENCY:                  National Ocean Survey                 IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   30° 21.7' N (  30.36170)          LONGITUDE:  88° 39.8' W ( -88.66330)


The benchmark is a disk 12.6m (41.2 ft) SSE of 52-inch oak, 5.0m (16.5 ft) SE of
centerline of Graveline Road, 4.4m (14.5 ft) NE of power pole, 0.6m (1.9 ft) NNW
of 4-foot chainlink fence and is 0.1m below grade encased in pvc pipe and
concrete.



                         BENCH MARK STAMPING:  2205 D 1980
                         DESIGNATION:          874 2205 D

MONUMENTATION:           Tidal Station disk                    VM#:        21229
AGENCY:                  National Ocean Survey                 IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   30° 21.7' N (  30.36170)          LONGITUDE:  88° 39.8' W ( -88.66330)


The benchmark is a disk 18.3m (60 ft) SW of power pole, 13.2m (43.4 ft) W of
centerline to centerline of Graveline Road and paved road which intersects
Graveline Road approximately 115.8m N of Pier Graveline Restaurant, 6.2m (20.4
ft) NW of centerline of Graveline Road and 0.1m below grade encased in a pvc
pipe and concrete.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                                                
Station ID: 8742205                         PUBLICATION DATE:  10/02/2014
Name:       GRAVELINE BAYOU ENTRANCE                          
            MS
NOAA Chart: 11373                           Latitude:   30° 21.7' N (  30.36170)
USGS Quad:  PASCAGOULA                      Longitude:  88° 39.8' W ( -88.66330)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  2205 E 1980
                         DESIGNATION:          874 2205 E

MONUMENTATION:           Tidal Station disk                    VM#:        21230
AGENCY:                  National Ocean Survey                 IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   30° 21.7' N (  30.36170)          LONGITUDE:  88° 39.8' W ( -88.66330)


The benchmark is a disk  20m (65.6 ft) E of a 22-inch pine (which is in the
median between Graveline Road and Tarpon Road), 19.2m (63 ft) SE of centerline
of Graveline Road, 13.5m (44.3 ft) SW of power pole and 0.1m below grade encased
in a pvc pipe and concrete.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                                                
Station ID: 8742205                         PUBLICATION DATE:  10/02/2014
Name:       GRAVELINE BAYOU ENTRANCE                          
            MS
NOAA Chart: 11373                           Latitude:   30° 21.7' N (  30.36170)
USGS Quad:  PASCAGOULA                      Longitude:  88° 39.8' W ( -88.66330)


                            T I D A L   D A T U M S 


Tidal datums at GRAVELINE BAYOU ENTRANCE based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           November 1980 - October 1981
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8747437 BAY WAVELAND YACHT CLUB, BAY ST. LOUIS


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:

     HIGHEST OBSERVED WATER LEVEL (05/05/1981)         =  0.835
     MEAN HIGHER HIGH WATER                     MHHW   =  0.498
     MEAN HIGH WATER                            MHW    =  0.471
     MEAN SEA LEVEL                             MSL    =  0.252
     MEAN TIDE LEVEL                            MTL    =  0.251
     MEAN LOW WATER                             MLW    =  0.031
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/17/1981)         = -0.579

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     2205 A 1980                                 4.515    4.044
     2205 B 1980                                 4.808    4.337
     2205 C 1980                                 4.809    4.338
     2205 D 1980                                 5.104    4.633
     2205 E 1980                                 5.060    4.589


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  5

                                                                                
Station ID: 8742205                         PUBLICATION DATE:  10/02/2014
Name:       GRAVELINE BAYOU ENTRANCE                          
            MS
NOAA Chart: 11373                           Latitude:   30° 21.7' N (  30.36170)
USGS Quad:  PASCAGOULA                      Longitude:  88° 39.8' W ( -88.66330)


                             D E F I N I T I O N S


Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal
Datum Epoch.  It pertains to local mean sea level and should not be confused
with the fixed datums of North American Vertical Datum of 1988 (NAVD88).

NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum
constraint adjustment of Canadian/Mexican/United States leveling observations.
Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as
the single initial constraint.  NAVD88 replaces NGVD29 as the national
standard geodetic reference for heights.  Bench mark elevations relative to
NAVD88 are available from NGS through the World Wide Web at 
National Geodetic Survey.

NGVD29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded.  NGVD29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads.  NGVD29 was originally derived from a general
adjustment of the first-order leveling networks of the U.S. and Canada after
holding mean sea level observed at 26 long term tide stations as fixed.
Numerous local and wide-spread adjustments have been made since establishment in
1929.  Bench mark elevations relative to NGVD29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at 
National Geodetic Survey.

NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to
local MSL and other tidal datums may not be consistent from one location to
another.

The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique
identifiers for bench marks in the tidal and geodetic databases, respectively.
Each bench mark in either database has a single, unique VM# and/or PID# assigned.
Where both VM# and PID# are indicated, both tidal and geodetic elevations are
available for the bench mark listed. The NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.

The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD88 elevations.
The NAVD88 elevation relationship shown in the table is derived from an average
of several bench mark elevations relative to tide station datum.  As a result of
this averaging, NAVD88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD88 elevations listed for
each bench mark in the NGS database.

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Products available at 8742205 GRAVELINE BAYOU ENTRANCE, MS

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services